HELOC Payment Calculator

About the HELOC Payment Calculator

A Home Equity Line of Credit (HELOC) works differently from a standard mortgage. During the draw period (typically 5–10 years), you can borrow against your equity and usually pay only interest. When the draw period ends, the repayment period begins (10–20 years) and payments jump as you amortize the outstanding balance. Because most HELOCs carry variable interest rates tied to the prime rate, both your draw-period and repayment-period payments can fluctuate with market conditions.

This payment transition catches many homeowners off guard. An interest-only payment of $300/month can become $700+ when amortization begins, and rising rates can compound the shock. Understanding both phases before you open a HELOC is essential for budgeting and long-term financial planning.

This HELOC Payment Calculator shows your interest-only payment during the draw period, the fully amortizing payment during repayment, and the total interest cost across both phases. Use it to compare different draw amounts, rates, and term combinations before committing to a line of credit.

When This Page Helps

HELOCs are flexible and often carry lower rates than credit cards or personal loans, but the two-phase payment structure adds complexity that catches borrowers off guard. Use this calculator to see exactly how much your payment will change when the draw period ends, so you can plan your borrowing strategy and avoid payment shock. You can also model scenarios where you make principal payments during the draw period to reduce the balance and soften the transition to full amortization.

How to Use the Inputs

1. Enter the amount you plan to borrow (your HELOC balance).
2. Set the interest rate (HELOCs typically have variable rates).
3. Enter the draw period length in years (usually 5–10).
4. Enter the repayment period length in years (usually 10–20).
5. Review the interest-only payment during the draw period.
6. See the fully amortizing payment that begins after the draw period.
7. Check the total interest paid across both periods.

Example Calculation

Tips & Best Practices

• Make principal payments during the draw period to reduce the balance before amortization begins.
• Budget for the repayment-phase payment, not just the draw-phase interest-only amount.
• HELOC rates are usually variable — monitor rate changes and consider a fixed-rate conversion option if available.
• Keep your combined LTV (first mortgage + HELOC) below 80 % for the best rates.
• Consider whether a home equity loan (fixed rate, fixed payments) better suits your needs than a variable HELOC.
• Tax deductibility of HELOC interest depends on how you use the funds — consult a tax advisor.

Understanding the Two-Phase Structure

The draw period is your borrowing window. You can use the credit line like a checking account — borrow, repay, and borrow again. Minimum payments cover only interest. When the draw period ends, the line freezes and you enter the repayment period, where the balance is amortized with fixed monthly payments.

Managing the Payment Transition

The jump from interest-only to fully amortizing can increase payments by 30–50 % or more. The best strategy is to start reducing your balance before the transition. Even modest principal payments during the draw period can significantly soften the shock.

HELOC vs Alternative Options

Compare a HELOC to a home equity loan (fixed rate, lump sum), a cash-out refinance (replaces your first mortgage), or a personal loan (no home collateral). Each has different rate structures, closing costs, and tax implications. A HELOC is ideal when you need flexible access to funds over time rather than a single lump sum.

Frequently Asked Questions

• What is the difference between a HELOC and a home equity loan?

  A HELOC is a revolving credit line with variable rates and two payment phases (interest-only draw, then amortizing repayment). A home equity loan is a fixed-rate lump sum with fixed monthly payments from day one. HELOCs offer more flexibility; home equity loans offer more predictability.

• What happens when the draw period ends?

  You can no longer borrow additional funds, and the outstanding balance begins to amortize over the repayment period. Monthly payments typically increase significantly because you are now paying both principal and interest.

• Can I pay principal during the draw period?

  Yes, most HELOCs allow principal payments at any time. Reducing the balance during the draw period lowers both your interest costs and the eventual repayment-phase payment. Some borrowers treat the draw period interest-only minimum as a floor and pay more.

• Are HELOC rates fixed or variable?

  Most HELOCs have variable rates tied to the prime rate. Some lenders offer a fixed-rate lock option that converts all or part of your balance to a fixed rate for a set period. Variable rates mean your interest-only payment can increase even during the draw period.

• How much can I borrow with a HELOC?

  Lenders typically allow a combined loan-to-value (CLTV) of up to 80–85 %. For example, if your home is worth $400,000 and your first mortgage balance is $250,000, you could potentially qualify for a HELOC up to $70,000–$90,000.

• Is HELOC interest tax deductible?

  HELOC interest may be deductible if the funds are used to buy, build, or substantially improve the home that secures the loan. Interest on HELOCs used for other purposes (debt consolidation, college tuition) is generally not deductible. Consult your tax advisor.